Oes to the webstee



(No Model.)

T. K. WEBSTER 8v J. GHIVILL.

SCREW GQNVEYBR.

No. 276.103. la. '/l Patented Apr.17,1883. l

UNITED STATES TOWNER K. WEBSTER AND JOHN CHIVILL, OF CHICAGO, ILLINOIS, ASSIGN- PATENT OFFICE.

OBS TO THE WEBSTER & COMSTOCK MANUFACTURING COMPANY, OF

SAME PLACE.

SCREW-CONVEYER.

SPECIFICATION lforming part of Letters Patent No. 276,103, dated April 17, 1883. Application filed January 18, 1883. (No model.)

To all whom it may concern Be it known that we, ToWNER K. WEBSTER and JOHN CH1v1LL,of Chicago, in the county of Cook and State of Illinois, citizens of the United States of America, have invented certain new and useful Improvements in Screw- Conveyers, ot which the following, in connectiol with the accompanying drawings, is a specification.

In the drawings, Figure l is a side view of a screw-conveyer embodying our inventi'on. Fig. 2 is a vertical central section of the same, and Fig. 3 is a transverse section.

Like letters of reference indicate like parts. A is a hollow shaft, and B is the Hight-screw or spiral applied thereto. We deem it preferable to make the flight or screw of pieces of sheet-steel a. a, each of such a length that when applied spirally to the shaft the ends of each zo piece will be on opposite sides of the shaft. ln other words, each piece is of such alength that when applied it will extend a little more than one-halt' the way aro'und the shaft, the excess of length over one-half being such as to permit the meeting ends of each piece a a to be lapped sufficiently to be there riveted together, as indicated at a a.

C is a metallic brace extending longitudinally through the shaft A. This brace we 3o make of two pieces, b b, each having a central Hat portion or back, c c, and inclined side portions, c c'. The pieces b b are arranged together back to back, and the portions c c extend out to and against the interior surface of the shaft, as is clearly indicated .in Figs. 2 and D D are lugs passing transversely through the shaft and through the brace C. These lugs are shouldered to clamp the shaft on one side, as shown at d d, and are headed down 4o uponthe other or opposite side of the shaft,

as shown at d d. They also project outwardly from the shoulders d d, as shown at e e, and are there flattened somewhat and riveted or otherwise firmly secured to the spiral A. Each section of the shaft should be braced in the manner described. The sections may be coupled in any well known or suitable way. By these means the shaft is greatly strengthened and prevented from being twisted by reason of the torsional strain upon it while ,it isbeing used. ,The spiral or screw is also very strongly secured to the shaft, and the means to these ends may be made and applied with facility.

We are aware that a conveyer has been devised having a hollow shaft, and that such shaft has been filled with wooden blocks and cross-braced within. We dispense with the blocks, and by our method of bracing obtain a' light and strong structure.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is-

r`1. The hollow eonveyer-shaft A, in combination with the double brace C, arranged within said shaft, the central portions bearing against each other and the side portions against the shaft, as'and for the purpose set forth.

2. The hollow' conveyer-shaft A, in combination with the double brace C, arranged within said shaft, in the manner and for the purpose set forth. f'

3. The conveyer-shaft A and the flight B,

arranged on the shaft, in combination with the lug D, passing transversely through the shaft, secured at one end from coming out and at the other end to the ight, as set t'orth.l

4. As a means of securing elevator-flights to their shafts, a lug, D, having a portion for passing through the shaft and adapted to t the shaft at its head, as set forth.

TOWNER K. WEBSTER. JOHN CHIVILL. Witnesses N. CoWLEs, .M W. R. IOUETT. 

